[Sprint to invest $1 billion and joint venture partners to add an additional $500 million into Clearwire's WiMAX build out sources tell the Wall Street Journal.]

By Jeffrey McCracken and Don Clark (WSJ) -- "Sprint Nextel Corp. and its partners are preparing to pump at least $1.5 billion more into Clearwire Corp., said two people familiar with the matter, adding yet more aid to a wireless broadband firm that has struggled to build out its next-generation network."